Hunter HD Elite - Encountering Forcematch Prediction Errors

Position the valve stem at 12:00 and touch “Enter
Valve Stem”.
Mark the tire with a piece of chalk or a marker with a “V”
opposite the valve stem as indicated. Touch “OK” or tap the
foot pedal when completed.
Use a tire changer and rotate the rim 180 degrees relative to the tire,
aligning the “V” mark with the valve stem. Mount the assembly on the
balancer. Position valve stem at 12:00 and press “Enter Valve Stem”.
Lower the hood to start the ForceMatch®
measurement.
5.2.2. Encountering Forcematch® Prediction Errors
Below are some reasons why the HD® Elite may not match or quantify the value of the tire or the assembly.
• Incorrect Mechanical Wheel Mounting on the Shaft: This can be caused from worn or damaged adaptors, rust or debris
on the wheel, shaft, hub, adaptors, or a cone contacting a wheel on an irregular surface. Verify proper mounting by
performing a centering check.
• External Rim Measurement vs. Actual Bead Seat Measurement: There is a high correlation between external and
internal measurement, however the operator must consider each wheel design individually. Some cast or closed-
faced wheels cannot be accurately measured externally. The tire must be removed for accurate bead seat runout
measurements.
• Air Pressure Readings Before and After Matching Differ: The air pressure should remain constant between each
measurement. Always inate tires to the recommended pressure specied by the vehicle manufacturer.
• Incorrect Tire Bead Seating Procedures: Tire technology is always changing. Today’s vehicles 48 Balancing Procedures
require the tire to be designed to tightly adhere to the wheel, preventing slippage between the two components. As a
result, incorrect tire bead seating procedures are becoming more of an issue in solving vibration complaints.
In many cases, a wheel will display high non-uniformity values because of increased tire bead interference, wheel design,
or improper bead seating procedures. If the tire is re-loosened from the wheel and properly lubricated and remounted,
the level of non-uniformity may decrease dramatically. On sensitive vehicles, sometimes there is benet to slightly
over-inating the tire, deating the air, and then re-inating to optimize bead seating.
• Insucient Use of Tire Mounting Lube During Mounting: “Lube is Good!” Proper lubrication on the tire bead and rim
areas including bead seat, hump, balcony, and drop center are vital in achieving proper seating of the tire bead to the
wheel assembly. Aggressive acceleration or braking should be avoided for the rst 500 miles to prevent tire to wheel
slippage.
HD Elite Wheel Balancer
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